diff --git a/backend/composer.json b/backend/composer.json
index aa57d1f..2eff6bd 100644
--- a/backend/composer.json
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@@ -20,5 +20,8 @@
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diff --git a/backend/composer.lock b/backend/composer.lock
index 010ada5..efc5f97 100644
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+                }
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+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
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diff --git a/backend/phpunit.xml b/backend/phpunit.xml
new file mode 100644
index 0000000..e0a733a
--- /dev/null
+++ b/backend/phpunit.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         cacheDirectory=".phpunit.cache"
+         executionOrder="depends,defects"
+
+         colors="true">
+    <testsuites>
+        <testsuite name="unit">
+            <directory>tests/Unit</directory>
+        </testsuite>
+    </testsuites>
+    <source>
+        <include>
+            <directory>app</directory>
+        </include>
+    </source>
+</phpunit>
diff --git a/backend/tests/Fakes/FakeClock.php b/backend/tests/Fakes/FakeClock.php
new file mode 100644
index 0000000..f112836
--- /dev/null
+++ b/backend/tests/Fakes/FakeClock.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace Tests\Fakes;
+
+use App\Auth\Clock;
+use DateTimeImmutable;
+
+class FakeClock implements Clock
+{
+    public function __construct(private DateTimeImmutable $currentTime) {}
+
+    public function now(): DateTimeImmutable
+    {
+        return $this->currentTime;
+    }
+
+    public function setTime(DateTimeImmutable $newTime): void
+    {
+        $this->currentTime = $newTime;
+    }
+}
diff --git a/backend/tests/Fakes/FakePasswordHasher.php b/backend/tests/Fakes/FakePasswordHasher.php
new file mode 100644
index 0000000..9e93325
--- /dev/null
+++ b/backend/tests/Fakes/FakePasswordHasher.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace Tests\Fakes;
+
+use App\Auth\PasswordHasher;
+
+class FakePasswordHasher implements PasswordHasher
+{
+    public function hash(string $password): string
+    {
+        return 'hashed:'.$password;
+    }
+
+    public function verify(string $password, string $hash): bool
+    {
+        return $this->hash($password) === $hash;
+    }
+}
diff --git a/backend/tests/Fakes/FakeSessionRepository.php b/backend/tests/Fakes/FakeSessionRepository.php
new file mode 100644
index 0000000..78a402d
--- /dev/null
+++ b/backend/tests/Fakes/FakeSessionRepository.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace Tests\Fakes;
+
+use App\Auth\CreateSessionDto;
+use App\Auth\Session;
+use App\Auth\SessionRepository;
+
+class FakeSessionRepository implements SessionRepository
+{
+    private array $sessions = [];
+
+    public function create(CreateSessionDto $dto): Session
+    {
+        $session = new Session(
+            token: $dto->token,
+            user: $dto->user,
+            createdAt: $dto->createdAt,
+            expiresAt: $dto->expiresAt,
+        );
+        $this->sessions[$dto->token] = $session;
+
+        return $session;
+    }
+
+    public function findByToken(string $token): ?Session
+    {
+        $session = $this->sessions[$token] ?? null;
+
+        if ($session === null) {
+            return null;
+        }
+
+        return new Session(
+            token: $session->getToken(),
+            user: $session->getUser(),
+            createdAt: $session->getCreatedAt(),
+            expiresAt: $session->getExpiresAt(),
+        );
+    }
+
+    public function deleteByToken(string $token): void
+    {
+        unset($this->sessions[$token]);
+    }
+}
diff --git a/backend/tests/Fakes/FakeTokenGenerator.php b/backend/tests/Fakes/FakeTokenGenerator.php
new file mode 100644
index 0000000..5ea234c
--- /dev/null
+++ b/backend/tests/Fakes/FakeTokenGenerator.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace Tests\Fakes;
+
+use App\Auth\TokenGenerator;
+use RuntimeException;
+
+class FakeTokenGenerator implements TokenGenerator
+{
+    private int $callCount = 0;
+
+    public function __construct(private array $tokens) {}
+
+    public function generate(): string
+    {
+        if ($this->callCount >= count($this->tokens)) {
+            throw new RuntimeException(
+                'FakeTokenGenerator exhausted'
+            );
+        }
+        $token = $this->tokens[$this->callCount];
+        $this->callCount++;
+
+        return $token;
+    }
+}
diff --git a/backend/tests/Fakes/FakeUserRepository.php b/backend/tests/Fakes/FakeUserRepository.php
new file mode 100644
index 0000000..c816d1e
--- /dev/null
+++ b/backend/tests/Fakes/FakeUserRepository.php
@@ -0,0 +1,63 @@
+<?php
+
+namespace Tests\Fakes;
+
+use App\Shared\ValueObject\EmailAddress;
+use App\User\CreateUserDto;
+use App\User\User;
+use App\User\UserRepository;
+
+class FakeUserRepository implements UserRepository
+{
+    private array $users = [];
+
+    public function create(CreateUserDto $dto): User
+    {
+        $id = $this->nextId();
+
+        $user = new User(
+            id: $id,
+            email: $dto->email,
+            passwordHash: $dto->passwordHash,
+        );
+
+        $this->users[$id] = $user;
+
+        return $user;
+    }
+
+    public function findByEmail(EmailAddress $email): ?User
+    {
+        foreach ($this->users as $user) {
+            if ($user->getEmail()->value() === $email->value()) {
+                return new User(
+                    id: $user->getId(),
+                    email: $user->getEmail(),
+                    passwordHash: $user->getPasswordHash(),
+                );
+            }
+        }
+
+        return null;
+    }
+
+    public function find(int $id): ?User
+    {
+        $user = $this->users[$id] ?? null;
+
+        if ($user === null) {
+            return null;
+        }
+
+        return new User(
+            id: $user->getId(),
+            email: $user->getEmail(),
+            passwordHash: $user->getPasswordHash(),
+        );
+    }
+
+    private function nextId(): int
+    {
+        return count($this->users);
+    }
+}
diff --git a/backend/tests/Unit/Auth/UseCases/AuthenticateUserTest.php b/backend/tests/Unit/Auth/UseCases/AuthenticateUserTest.php
new file mode 100644
index 0000000..31ec0c9
--- /dev/null
+++ b/backend/tests/Unit/Auth/UseCases/AuthenticateUserTest.php
@@ -0,0 +1,126 @@
+<?php
+
+namespace Tests\Unit\Auth\UseCases;
+
+use App\Auth\UseCases\AuthenticateUser\AuthenticateUser;
+use App\Auth\UseCases\AuthenticateUser\AuthenticateUserRequest;
+use App\Exceptions\BadRequestException;
+use App\Exceptions\UnauthorizedException;
+use App\Shared\ValueObject\EmailAddress;
+use App\User\CreateUserDto;
+use PHPUnit\Framework\TestCase;
+use Tests\Fakes\FakePasswordHasher;
+use Tests\Fakes\FakeUserRepository;
+
+class AuthenticateUserTest extends TestCase
+{
+    private FakeUserRepository $userRepo;
+    private FakePasswordHasher $hasher;
+    private AuthenticateUser $useCase;
+
+    protected function setUp(): void
+    {
+        $this->userRepo = new FakeUserRepository();
+        $this->hasher = new FakePasswordHasher();
+        $this->useCase = new AuthenticateUser(
+            $this->userRepo,
+            $this->hasher,
+        );
+
+        $this->userRepo->create(new CreateUserDto(
+            email: new EmailAddress('user@example.com'),
+            passwordHash: $this->hasher->hash('correct-password'),
+        ));
+    }
+
+    public function testAuthenticatesWithValidCredentials(): void
+    {
+        $user = $this->useCase->execute(new AuthenticateUserRequest(
+            email: 'user@example.com',
+            password: 'correct-password',
+        ));
+
+        $this->assertSame('user@example.com', $user->getEmail()->value());
+    }
+
+    public function testThrowsBadRequestWhenEmailIsEmpty(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('email is required');
+
+        $this->useCase->execute(new AuthenticateUserRequest(
+            email: '',
+            password: 'some-password',
+        ));
+    }
+
+    public function testThrowsBadRequestWhenPasswordIsEmpty(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('password is required');
+
+        $this->useCase->execute(new AuthenticateUserRequest(
+            email: 'user@example.com',
+            password: '',
+        ));
+    }
+
+    public function testThrowsBadRequestWhenEmailIsNull(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('email is required');
+
+        $this->useCase->execute(new AuthenticateUserRequest(
+            email: null,
+            password: 'some-password',
+        ));
+    }
+
+    public function testThrowsBadRequestWhenPasswordIsNull(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('password is required');
+
+        $this->useCase->execute(new AuthenticateUserRequest(
+            email: 'user@example.com',
+            password: null,
+        ));
+    }
+
+    public function testThrowsUnauthorizedForUnknownEmail(): void
+    {
+        $this->expectException(UnauthorizedException::class);
+        $this->expectExceptionMessage('invalid credentials');
+
+        $this->useCase->execute(new AuthenticateUserRequest(
+            email: 'unknown@example.com',
+            password: 'some-password',
+        ));
+    }
+
+    public function testThrowsUnauthorizedForWrongPassword(): void
+    {
+        $this->expectException(UnauthorizedException::class);
+        $this->expectExceptionMessage('invalid credentials');
+
+        $this->useCase->execute(new AuthenticateUserRequest(
+            email: 'user@example.com',
+            password: 'wrong-password',
+        ));
+    }
+
+    public function testReturnsNewInstanceOnEachCall(): void
+    {
+        $user1 = $this->useCase->execute(new AuthenticateUserRequest(
+            email: 'user@example.com',
+            password: 'correct-password',
+        ));
+
+        $user2 = $this->useCase->execute(new AuthenticateUserRequest(
+            email: 'user@example.com',
+            password: 'correct-password',
+        ));
+
+        $this->assertNotSame($user1, $user2);
+    }
+}